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41. Re: [TenTec] Centaur Tubes odd ones in parallel (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Thu, 2 Apr 2015 14:56:14 -0600; I never use tetrodes myself and that is what QRO uses. Commander may have one of the best RF decks in the business. But their control board is in need of help generally particularly their switching.; /archives//html/TenTec/2015-04/msg00043.html (15,688 bytes)
42. Re: [TenTec] Centaur Tubes odd ones in parallel (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Thu, 2 Apr 2015 16:11:26 -0600; Yes, indeed. But I only think of their higher power options with two or three holes of 4cx800 tetrodes. These sorts of ceramics with their high dissipation are where switching gets more difficult. I; /archives//html/TenTec/2015-04/msg00045.html (11,945 bytes)
43. [TenTec] Posting to the Ten Tec Reflector (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Wed, 28 Jan 2015 11:51:22 -0500; We have numerous followers of this reflector who are not subscribers. Occasionally, but regularly, these observers attempt to post comments to the list. The amount of administrative review required o; /archives//html/TenTec/2015-01/msg00249.html (7,478 bytes)
44. Re: [TenTec] Centurion is on the Fritz (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Thu, 23 Oct 2014 16:29:39 -0400; Start by making sure the bias is switching from cutoff. It doesn't sound like it is. If the switch is a relay you may hear it close. If it closes and you have no idling current then perhaps you have; /archives//html/TenTec/2014-10/msg00221.html (10,697 bytes)
45. Re: [TenTec] Oooo-PS (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Sat, 20 Sep 2014 15:39:18 -0400; I agree with Carl, the USPO is reliable, even with heavy amplifiers, provided the appropriate packaging and "FRAGILE" or "GLASS" labels are applied, including, "THIS SIDE UP". They help with hand car; /archives//html/TenTec/2014-09/msg00286.html (13,155 bytes)
46. Re: [TenTec] din connector, etc. (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Wed, 24 Sep 2014 15:07:47 -0400; The Orion II delays RF for 15 ms after closure of the amplifier contacts. This applies to Ant1 and Ant2 as well. The amplifier hang time is adjustable for either Ant1 or Ant2 but the 15 ms delay is n; /archives//html/TenTec/2014-09/msg00368.html (11,642 bytes)
47. Re: [TenTec] din connector, etc. (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Wed, 24 Sep 2014 16:30:53 -0400; I'll ask on the 565/566 reflector whether anyone has issues with the 15 ms delay. My relays close in under 1 ms and I don't notice a problem. Maybe I didn't watch the scope close enough. I can hear e; /archives//html/TenTec/2014-09/msg00375.html (14,437 bytes)
48. Re: [TenTec] din connector, etc. (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Thu, 25 Sep 2014 09:45:20 -0400; So why then do the manufacturers design the T/R switching with this delay? Is it to avoid hot switching in the amplifier should one be used. Not really. This delay is necessary to permit settling of; /archives//html/TenTec/2014-09/msg00412.html (12,495 bytes)
49. Re: [TenTec] din connector, etc. (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Thu, 25 Sep 2014 09:45:06 -0400; So why then do the manufacturers design the T/R switching with this delay? Is it to avoid hot switching in the amplifier should one be used. Not really. This delay is necessary to permit settling of; /archives//html/TenTec/2014-09/msg00413.html (12,694 bytes)
50. Re: [TenTec] din connector, etc. (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Thu, 25 Sep 2014 15:33:47 -0400; So if the ARRL lab test is correct, and the RF delay is 17 ms on the Eagle, then time to settle receiving again is 70-17=53 ms. The TS 590S total turn around is only 20 ms. If you want to break into; /archives//html/TenTec/2014-09/msg00417.html (12,592 bytes)
51. Re: [TenTec] Hercules 444 amp (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Tue, 12 Aug 2014 21:06:27 -0400; There are control boards available to trip out at adjustable levels of grid current. If you want to monitor each tube individually, you could switch which triode you are monitoring, or install a seco; /archives//html/TenTec/2014-08/msg00191.html (13,362 bytes)
52. Re: [TenTec] Hercules 444 amp (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Wed, 13 Aug 2014 09:01:26 -0400; The matching of the tubes when purchased assures they will draw approximately the same grid current in the amp. Proper biasing will help assure the cleanest signal for the selected class of service.; /archives//html/TenTec/2014-08/msg00204.html (17,385 bytes)
53. Re: [TenTec] Hercules 444 amp (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Wed, 13 Aug 2014 13:22:07 -0400; The whole world seems to buy matched pairs or quads. There doesn't seem to be a need for this when buying ceramic triodes, although some users at VHF and UHF still try to buy matched pairs. I see tha; /archives//html/TenTec/2014-08/msg00219.html (12,272 bytes)
54. Re: [TenTec] Eagle vs. TS-590S (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Sun, 6 Jul 2014 14:09:02 -0400; I have enjoyed the 590 both in my station with a large monoband array, and portable with a fan dipole. The receiver is simply amazing in every aspect. The human interface is simply superb and offers; /archives//html/TenTec/2014-07/msg00145.html (12,766 bytes)
55. Re: [TenTec] Eagle vs. TS-590S (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Sun, 6 Jul 2014 18:10:11 -0400; Sorry but Kenwood does not charge at their service centers on the east or west coast here in the USA. Mike W2AJI Sent from my iPhone; /archives//html/TenTec/2014-07/msg00158.html (15,477 bytes)
56. Re: [TenTec] Eagle vs. TS-590S (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Sun, 6 Jul 2014 19:08:26 -0400; I waited to buy until the factory modified the new boards. My radio was built this past March and was modified at the factory. Apparently not many people have experienced problems with production fro; /archives//html/TenTec/2014-07/msg00165.html (17,819 bytes)
57. Re: [TenTec] Source for TITAN 425 plate choke? (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Wed, 16 Jul 2014 14:39:34 -0400; RF Parts replacement choke is 55 micro Henry and should work fine. Mike W2AJI Sent from my iPhone; /archives//html/TenTec/2014-07/msg00508.html (7,963 bytes)
58. Re: [TenTec] Trading radios (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Sun, 1 Jun 2014 13:39:22 -0400; In my case the RF is radiated from my Yagi and the coax shield picks up the radiation between the antenna feed point and the radio. With good quality cable, the center conductor is not radiating. How; /archives//html/TenTec/2014-06/msg00005.html (9,795 bytes)
59. Re: [TenTec] Trading radios (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Sun, 1 Jun 2014 18:13:39 -0400; What I said was: "With good quality cable, the center conductor is not radiating. However, the shield may indeed be carrying current." I don't think you have my meaning and have taken it out of conte; /archives//html/TenTec/2014-06/msg00016.html (16,567 bytes)
60. Re: [TenTec] Trading radios (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Sun, 1 Jun 2014 22:29:14 -0400; Of course many coaxial cables are used which do not contain silver plated conductors. Indeed, at low HF frequencies, the depth of penetration into the surface of the conductor, ie skin depth, is quit; /archives//html/TenTec/2014-06/msg00020.html (26,788 bytes)

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